TY  - JOUR
AU  - V. L. Selivanov
TI  - Difference Hierarchy in $\varphi$-Spaces
JO  - Algebra i logika
PY  - 2004
SP  - 425
EP  - 444
VL  - 43
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/AL_2004_43_4_a2/
LA  - ru
ID  - AL_2004_43_4_a2
ER  -